Purging Air And Checking Gas Leakage; Refilling Refrigerant - Daikin FTX09BXVJU Installation Manual

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• When piping work is completed, it is necessary to purge the air and check for gas leakage

WARNING

1) Do not mix any substance other than the specified refrigerant (R410A) into the refrigeration cycle.

2) When refrigerant gas leaks occur, ventilate the room as soon and as much as possible.

3) Refrigerants should always be recovered and never be released directly into the environment.

4) Use a vacuum pump for R410A exclusively. Using the same vacuum pump for different refrigerants may damage the vacuum pump or the unit.

• If using additional refrigerant, perform air purging from the refrigerant

pipes and indoor unit using a vacuum pump, then charge additional

refrigerant.

• Use a hexagonal wrench 5/32" (4mm) to operate the stop valve rod.

• All refrigerant pipe joints should be tightened with a torque wrench at

the specified tightening torque.

1) Pressurize the liquid pipe and gas pipe from the service ports of each stop valve to 604psi (4.17MPa) (do not

pressurize more than 604psi(4.17MPa)) for 1 hour minimum, 24 hours recommended.

If there is a pressure drop, check for leaks, make repairs and perform the pressure test again.

2) Connect the gauge manifold's charging hose to the gas stop valve's service port.

3) Fully open the low-pressure valve (Lo) on the gauge manifold and fully close the high-pressure valve (Hi).

(High-pressure valve will require no further operation.)

4) Evacuate system using vacuum pump to below 500 microns for 1 hour minimum.

5) Close the low-pressure valve (Lo) on the gauge manifold and stop vacuum pumping.

(Maintain this condition for a few minutes to make sure the compound pressure gauge pointer does not swing

back.)

6) Remove the valve caps from the liquid stop valve and gas stop valve.

7) To open the liquid stop valve, turn the rod of the valve 90° counter clockwise using a hexagonal wrench.

Close it after 5 seconds and check for gas leakage.

Using soapy water, check for gas leakage from the indoor unit's flare and outdoor unit's flare and valve rods.

After the check is complete, wipe all soapy water off.

8) Disconnect the charging hoses from the service port for the gas stop valve, then fully open the liquid and gas stop

valves.

(Do not attempt to turn the valve rods further than they can go.)

9) Tighten the valve caps and service port caps for the liquid and gas stop valves with a torque wrench to the specified

torques.

Refer to "4. Refrigerant piping" on page 1-11 for details.

If the compound pressure gauge pointer swings back, the refrigerant may have water content or there may be a

loose pipe joint.

Check all pipe joints and retighten nuts as needed, then repeat step 3) through 5).

Check the type of refrigerant to be used on the machine nameplate.

Precautions when adding R410A

Fill from the liquid pipe in liquid form.

This is a mixed refrigerant, so adding it in gas form may cause the refrigerant composition to change, preventing normal

operation.

1) Before filling, check whether the cylinder has a siphon attached or not. (It should have something like "liquid filling

siphon attached" displayed on it.)

Filling a cylinder with an attached siphon

Stand the cylinder upright when filling.

There is a siphon pipe inside, so the cylinder

need not be upside-down to fill with liquid.

• Be sure to use the R410A tools to ensure pressure and to prevent foreign objects entering.